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LM5116-HT: Low Cout due to temperature restrictions.

Nacho Martinez

Prodigy 135 points

Part Number: LM5116-HT
Other Parts Discussed in Thread: LM5116

Tool/software:

Hi there,

I am designing a power stage based on the LM5116JHD (LM5116-HT). Due to the high temperature ambient conditions (up to 175ºC ambient temperature), it is not possible to find capacitors that can withstand these temperatures and that have a high capacitance.

The standard values for high temperature capacitors are up to approximately 1 uF .

Due to this situation the Cout, which should be 400 uF to reduce the output ripple, is in my case about 5 uF.

The result is that the output has a very high ripple.

How can I solve this problem without using Tantalum capacitors?

Thanks in advance.

0 Onkar Bhakare 6 months ago

TI__Genius 14406 points

Hi Nacho

Voltage waveforms from the simulation results show instability which is appearing as high output ripple. Could you please fill the QuickStart for the device. It would help reviewing in detail.

here is the link - https://www.ti.com/tool/LM5116-5116WG-25116DESIGN-CALC

Nacho Martinez said:
How can I solve this problem without using Tantalum capacitors?

Is there any particular reason for not using Tantalum capacitors

Thank you

Regards

Onkar Bhakare

0 Nacho Martinez 6 months ago in reply to Onkar Bhakare

Prodigy 135 points

Hello Onkar,

I can´t fill it because it not appears the calculator at the website....

Onkar Bhakare said:
https://www.ti.com/tool/LM5116-5116WG-25116DESIGN-CALC

I can´t use it because it is an explosive ambient.

Onkar Bhakare said:
Is there any particular reason for not using Tantalum capacitors

Regards

0 Onkar Bhakare 6 months ago in reply to Nacho Martinez

TI__Genius 14406 points

Hi Nacho

Nacho Martinez said:
I can´t fill it because it not appears the calculator at the website....

Sorry for the bad link, you can use this to download QuickStart - https://www.ti.com/lit/zip/snvu051

Thank you

Regards

Onkar Bhakare

0 Nacho Martinez 6 months ago

Prodigy 135 points

Hi there Onkar,

There is the quickstart form filled: e2e.ti.com/.../7215.LM5116_5F00_quickstart.xls

Best regards.

0 Onkar Bhakare 6 months ago in reply to Nacho Martinez

TI__Genius 14406 points

Hi Nacho

Thanks for sharing this!

Converter is not stable with selected component values

You can use values suggested in "Frequency compensation graph" as starting point

Thank you

Regards

Onkar Bhakare

0 Nacho Martinez 6 months ago in reply to Onkar Bhakare

Prodigy 135 points

Hi Onkar,

Thank you for your response. With these values the simulation works better.

Best regards.

0 Onkar Bhakare 6 months ago in reply to Nacho Martinez

TI__Genius 14406 points

Thanks Nacho for the update!

0 Ryan Rah 5 months ago

Prodigy 180 points

Nacho Martinez
Can you please share your LTspice simulation.

0 Ryan Rah 5 months ago in reply to Ryan Rah

Prodigy 180 points

I mostly need the LM5116 model and .lib file!
What I created symbol based on .lib model is not working properly and gave an error

0 Onkar Bhakare 5 months ago in reply to Ryan Rah

TI__Genius 14406 points

Hi Ryan

I am closing this thread. You can connect with Nacho over E2e private message service.

Thank you

Regards

Onkar Bhakare

0 Onkar Bhakare 5 months ago in reply to Onkar Bhakare

TI__Genius 14406 points

Hi Ryan

Let me know if SIMPLIS would work for you

Thank you

Regards

Onkar Bhakare